H.3.2 Ionosphere

H.3.2.1. IRI 2007

IRI-2007 contains a number of options suitable for different applications. Recommended choices are indicated when the code is run. The accuracy of the IRI electron density model is typically

• 50-80 % at heights from 65 km to 95 km

• 5-15 % at heights from 100 km to 200 km during daytime

• 15-30 % at heights from 100 km to 200 km during night-time

• 15-25 % at heights from 200 km to 1 000 km at low and middle dip latitudes (< 60°)

• 50-80 % at heights from 200 km to 1 000 km at high dip latitudes (> 60°)

Table H-3 shows a typical altitude profile of electron density. This has been calculated from IRI-2007, at 0° longitude and latitude, on 1^st January, for a nearaverage sunspot number of 100, at 0 h and 12 h local time, using otherwise default options.

The IRI-2007 ([RN.9]) homepage is at http://IRI.gsfc.nasa.gov which provides information and references about the IRI project, lets users download the IRI Fortran source code, and lets them also compute and plot IRI parameters.

H.3.2.2. Auroral charging environment

The auroral charging environment in section 8.2.3 is expressed in terms of distribution function but charging simulations often require input spectra in terms of flux.

Flux in cm^-2s^-1sr^-1keV^-1 can be found from the distribution function as follows:

(H‑1)

where

E_keV is energy in keV